Test slope Jackson Meadows

Location Name: .5 km west of the grill/Tom’s meadow Region: Independence Lake Area Observation Date & Time: Saturday, February 2, 2019 - 02:30
Location: 39.423304, -120.433011 See map: CalTopo	Is this an Avalanche Observation?: Yes Conditions Alerts: Avalanche Activity Other Signs of Instability (cracking, whumpfing, collapsing) Other Signs of Instability (cracking, whumpfing, collapsing)›Shooting Cracks Recent Loading Recent Loading›Blowing Snow Recent Loading›More Than a Foot of New Snow Recent Loading›Snowfall Rates of More Than 1 in/hr Terrain Alerts: Terrain Matches the Advisory

Location Name:

.5 km west of the grill/Tom’s meadow

Region:

Independence Lake Area

Observation Date & Time:

Saturday, February 2, 2019 - 02:30

Location:

39.423304, -120.433011

See map: CalTopo

Is this an Avalanche Observation?:

Yes

Conditions Alerts:

Avalanche Activity
Other Signs of Instability (cracking, whumpfing, collapsing)
Other Signs of Instability (cracking, whumpfing, collapsing)›Shooting Cracks
Recent Loading
Recent Loading›Blowing Snow
Recent Loading›More Than a Foot of New Snow
Recent Loading›Snowfall Rates of More Than 1 in/hr

Terrain Alerts:

Terrain Matches the Advisory

Observation made by: Public

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Observation

Description of Snow, Weather, and Avalanche Conditions:

Non consequential test slope avalanche on a wind loaded feature triggered by a snowmobile in a NE aspect at 8000 ft .5 km west of the grill on a 38-43 degree slope in a 12’ wide area with a safe runout and eyes on around 2:30 pm. Observed fractures and shooting cracks. Two slabs were noted. One at a density change in the new storm snowpack and another at the depth of the new-old snow interface.

Hi winds and heavy snow noted and new snow to a depth of 64 cm was measured at elevation 7600 ft at 3:30 pm. Observation made by Sierra avalanche center motorized level 1 avi class.

Snowpit or crown profile photo or graph:

Snowpack Details

Persistent Weak Layers:

Buried

Terrain Details

Terrain: elevations:

Near Treeline

Terrain: aspects:

Avalanche Details

Avalanche Type:

Storm Slab

Failure Plane/Weak Layer:

New/old snow interface

Trigger

Trigger:

Snowmobiler

Trigger Modifier:

Intentionally Triggered

Terrain

Start Zone Slope Angle:

38degrees

Aspect:

Northeast

Starting Elevation:

near-treeline

Size

Destructive Size:

D1 Relatively harmless to people.

Relative Size:

R1 Very Small

Crown Height:

2 ft

Avalanche Width (Average width):

12ft.

Avalanche Length (Vertical Run):

10ft.

Weather Details

Elevation of Observation:

7000 - 8000 ft.

Blowing Snow:

Intense

Wind Direction:

Southwest

Wind Speed:

Moderate

Sky Cover:

Obscured by fog, etc

Highest Precipitation Rate:

Very Heavy Snowfall (S10 = 10 cm /~4 in per hour)

Precipitation:

Snow

Air temperature:

Below Freezing

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Test slope Jackson Meadows

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Test slope Jackson Meadows

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